Re: socket problem

Re: socket problem

[Arnaldo Carvalho de Melo]

Em Fri, Aug 24, 2001 at 11:59:21AM +0000, Pete Marvin King escreveu:
> 
>     Is it possible to increase the maximum sockets that can be opened
> simultaneously?
> I'd like it to reach 1024, is it possible?
> 
>     I'm currently doing a stress test on postgres. we created a dummy
> client that would
> connect to it 1024 times. But is just stops at 324,
> postgres reports : " postmaster: StreamConnection: accept: Too many open
> files in system".
> 
>     I don't think the problem is not with the file descriptors. Is it
> the max num of sockets?
> or maybe the maximum number of files that can be opened?
> 
>     Any help would be greatly appreciated.

increase te max number of fds in /proc/sys/fs/file-max and in ulimit -n

[root@brinquedo /root]# cat ~acme/max_sockets.c
#include <sys/types.h>
#include <sys/socket.h>

int main(void)
{
        int nr_sockets = 0;

        while(socket(PF_INET, SOCK_STREAM, 0) > 0)
                ++nr_sockets;
        printf("nr_sockets=%d\n", nr_sockets);
        return 0;
}
[root@brinquedo /root]# ulimit -n
4096
[root@brinquedo /root]# ./max_sockets
nr_sockets=4093
[root@brinquedo /root]# ulimit -n 8192
[root@brinquedo /root]# ./max_sockets
nr_sockets=7600
[root@brinquedo /root]# ulimit -n 16384
[root@brinquedo /root]# ./max_sockets
nr_sockets=7601
[root@brinquedo /root]# cat /proc/sys/fs/file-max
8192
[root@brinquedo /root]# echo 20000 > /proc/sys/fs/file-max
[root@brinquedo /root]# ./max_sockets
nr_sockets=16381

- Arnaldo

socket problem

[Pete Marvin King]

    Is it possible to increase the maximum sockets that can be opened
simultaneously?
I'd like it to reach 1024, is it possible?

    I'm currently doing a stress test on postgres. we created a dummy
client that would
connect to it 1024 times. But is just stops at 324,
postgres reports : " postmaster: StreamConnection: accept: Too many open
files in system".

    I don't think the problem is not with the file descriptors. Is it
the max num of sockets?
or maybe the maximum number of files that can be opened?

    Any help would be greatly appreciated.

    I'm using slackware 7.1 - linux 2.4.5

thanx,
marvin

re: socket problem

[Dan Kegel]

> Is it possible to increase the maximum sockets that can be opened
> simultaneously?
> I'd like it to reach 1024, is it possible?
> 
>     I'm currently doing a stress test on postgres. we created a dummy
> client that would connect to it 1024 times. But is just stops at 324,
> postgres reports : " postmaster: StreamConnection: accept: Too many open
> files in system".
> 
>     I don't think the problem is not with the file descriptors. Is it
> the max num of sockets?
> or maybe the maximum number of files that can be opened?

see http://www.kegel.com/c10k.html#limits.filehandles

You may need to raise ulimit, or perhaps /proc/sys/fs/file-max
- Dan

-- 
"I have seen the future, and it licks itself clean." -- Bucky Katt